Gear-cutting machine



3 SheefnS-Sheet (No-Model.) I

A, H. BRAINARD. GEAR GUTTING MACHINE. No. 472,519. Patented Apr. 12,1892} Wi'izze zay,

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GEAR CUTTING MACHINE Patented'Apr. 12

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(No Model.)

A H BRAINARD GEAR CUTTING MACHINE.- No. 472,519.

Patented Apr. 12, 1892.

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f r )6 v I 7Vi'inaysea UNITED STATES PATENT OFFICE.

AMOS H. BRAINARD, OF HYDE PARK, MASSACHUSETTS.

GEAR-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent NO. 472,519, dated April 12, 1892.

Application filed November 26. 1890. Serial No. 372,720. (No model.)

T0 at whom it may concern.-

Be it known that I, AMos H. BRAINARD, a citizen of the United States, residing at Hyde Park, in the county of Norfolk and State of Massachusetts, have invented certain new and usefulv Improvements in Gear-Cutting Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The invention hereinafter described relates to improvements in automatic gear-cutting machines and refers to a device for intermittingly applying power to the dividing mechanism, said device being an improvement on that shown and described in Letters Patent of the United States No. 310,7 96, granted on January 13,1885, to Z. B. Ooes and George W. Miller.

In the drawings, Figure 1 is a side elevation of a portion of the upper part of a gear-cutting machine, shown in side elevation. Fig. 2 is a top plan view of the same. Fig. 3 is a side elevation of the slide-bolt K, showing its hearings in vertical section. Fig. 4 is a plan view of said bolt. Fig. 5 is a longitudinal section of the eccentric-knob. Fig. 6 is a perspective view of the upper portion of the machine. Fig. 7 is a sectional elevation showing details of construction. Fig. 8 is an enlarged top plan view of the slide K and its bearing f. Fig. 9 is an enlarged side elevation showing the lower portion of lever M. Fig. 10 is a transverse section through slide K and its bearing f. Fig. 11 is a diminished side elevation showing the upper portion of the machine. Fig. 12 is a view taken at the right of Fig. 11. Fig. 13 is a detail view of parts of the belt-shipping device.

Similar letters refer to similar parts throughout the several views.

A denotes the frame of the machine, and B a stud, on which pulleys O and D are arranged, both pulleys being adapted to turn loosely thereon. The said stud is fixed to a bracket E,"secured to the frame A. The hub of the pulley C is provided with a pinion F, which engages a spur-gear G, said gear being firmly secured to a disk G, provided with a notch a in its periphery and fixed to the adjacent end of a shaft H. To the other end of the said shaft is affixed the necessary spur-gear for operating, by means of somewhat similar spur-gears known as change-gears, the

still much of the time undue wear and chafing of the belt and pulley and alsoloss of power results. By my improvement, which I will now proceed to describe, said wear and chafing and loss of power are obviated.

J represents a support-piece secured to the bracket E, said piece being supplied with bearings Z) and c for sustaining the latch or slide-bolt K, which looks the said disk G in position. (see Figs. 3 and 7) and has a spring e arranged therein and encompassing the shank of the bolt to throw said bolt forward at the proper time into the notch a of the disk G. The bolt K is also provided with an inclined planef, as shown.

Extending upward from the support-piece J is an arm g, provided at its top with a sleeve h, in which is arranged to slide a shipper S, consisting of a headed slide-rod 2' and two arms 10 k fixed thereto, the office of said shipper being to shift the belt L from the loose pulley D onto the pulley O, or vice versa, to operate at the proper time the change-gearmechanism. A spring 1", encompassing said slide-rod, bears against the sleeve h and the next adjacent arm and moves said slide-rod in a direction opposite to that in which it s moved by the lever M, to be hereinafter described. The slide-rod 1' is connected to the upper end of the longer arm of a lever M, the fulcrum of which is in ears Z, projecting from the arm g, the shorter arm of said lever having an anti-friction roll 7% bearing on the inclined plane f of the slide-bolt K. The end of the shank of the bolt K, extending beyond the bearing 1), is notched at n and engages the hooked end 0 The bearing (7 is chambered at cl ICO by the arrow in Fig. 1.

of a lever-latch N, the fulcrum j of which is in a lever O, the latter leverbeing fulcrumed at p to the lower end of the support-piece J. (See Figs. 1, (J, and 7.)

A spring q, secured to the under side of the bearing 1), bears at its free end on a pin r, projecting inward from the end of the shorter arm of the lever 0. Another spring .9, secured to said lever O, bears at its free end against the tail of the latch N and depresses its hooked end 0 into position to engage the notched end of the slide-bolt K when in the position shown in Fig. 1. t is a knob provided with an eccentric u and pivoted to the support-piece J, said eccentric being adapted to disengage the catch N from the slide-bolt K at the proper time during the movement of the upper arm of the lever O to the left. A chain it: is connected to a collar n, adjustably secured on the upper arm of the lever O, the opposite end of said chain being connected to the cutterslide (see Fig. 11) of an automatic gear-cutting machine. lVhat is known as the return motion of said cutter-slide imparts to the lever 0, through the mediuin of the chain it, the necessary movement for releasing the slide-boltK from the notch a in the disk at. The collar 1* is made adjustable on the said upper arm of the lever O, for the purpose of increasing or diminishing the movement of said lever when it is desirable.

The slide-bolt K is operated in the following manner: After a cutter has passed through the gear-blank to be cut and during the return of the cutter fora fresh cut motion is imparted through the medium of the chain w, lever O, and latch-lever N to the slide-bolt K, said slide-bolt being withdrawn su fficientl y from the notch a in the disk G to allow said disk to be revolved in the direction indicated The chain to is adjustably attached to the cutter-slide, so that it shall not become taut during the return motion of said cutter-slide, or until the cutter has passed sufficiently clear of the blank to be cut to permit the said blank to be revolved. Secured to the slide-bolt K is an inclined plane f. The movement of the slide-bolt K when being withdrawn from the notch a in the disk G causes theiuclined planefto come in contact with and impart motion to the lower or shorter arm of the lever M, the upper or long arm of said lever being attached to the headed slide-rod i of the shipper S. Motion is thereby imparted to shipperS, said shipper causing the belt L to run from the pulley D onto the pulley O, that carries the pinion F. The instant the slide-bolt- K is re leased from the notch in the disk Gsaid disk will revolve in the direction indicated by the arrow shown in said Fig. 1, impelled by motion from pinion F and imparting the same to its shaft II and the change-gears thereby operated. (See Fig. 12. The tail of the latchlever N is brought in contact with the adjust said disk G, and on completion of a revolution of said disk the slide-bolt K is again seated in the notch or of the said disk by the further expansion of the spring 6. The lever M now being out of contact with the incline f of the slide-bolt, the spring t" will instantly operate the shipper S and move the belt L from the pulley O to the pulley D. By adjusting eccentric u on its pin t the action of lever O in releasing catch N from slide K may I be arranged with the requisite degree of accuracy.

Having thus described my improvements, what I claim is 1. A gearing for intermittently applying power to the spacing device of an automatic gear-cutting machine, the same consisting of a pulley geared and arranged to drive the change-gear mechanism, and a loose pulley, and means, substantially as described, forintermittently movingthe driving-belt from one pulley to the other, said means being composed of a shipper, a support therefor, a shipperoperative lever fnlcrumed to said support, a slid e-bolt sustained in bearings therein, said bolt provided with an incline for moving the shipper-lever on disengagement of said slidebolt from disk G, a spring for reseating the slide-bolt in said disk, a lever-latch for retracting said bolt, a lever O, fulcrumed to the support-piece, provided with springs s (1, and the eccentric for adjusting the lever-latch in relation to the slide-bolt, said lever 0 connected to the slide of the machine for swinging it on its fulcrum, all substantially as specified.

2. The combination, with the gearing, of slide K, arm 9, shipper S, lever M, and arm 0, with its adjustable chain 20, lever N, springs s q, and eccentric u, all substantially as specified.

3. The combination, with the feed-shaft I of a gear-cutting machine, of shaft H, connected therewith by suitable change-gears, disk G, engaged by the slide K, gear G, connccted with disk G, pinion F, engaging gear G and carried by pulley C, the pulleys O D, belt L, shipper S, and automatic devices for working slide K, all substantially as specified.

4. The notched disk G, slide-bolt K, with its inclined plane, and spring c, lever M, rod t, spring i,and shipper-arms k is, all substantially as shown, and for the purpose set forth.

In testimony whereof I ailix my signature in presence of two witnesses.

AMOS H. BRAINARD.

Witnesses:

S. N. PIPER, C. F. DANIELS. 

